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What is the best reason why rainfall may not occur even when visibility is low in fog?

Answer and explanation

Correct answer: Fog droplets are very tiny and remain suspended

Direct answer: A. Fog is made of tiny condensed water droplets close to the ground, so it can reduce visibility strongly. However, rainfall requires droplets or ice particles to grow sufficiently large and heavy to fall through the air. Fog droplets often remain suspended because their small size allows air movement to support them. They may later evaporate, merge, or contribute to drizzle under suitable conditions, but low visibility alone does not guarantee rain. A is correct because it distinguishes the size and suspension of fog droplets from precipitation-sized drops. B is wrong: fog does contain liquid water droplets. C is wrong: visibility is reduced precisely because light is scattered by droplets, although visibility alone does not tell us that rain will occur. D is wrong: foggy air is generally moist, not always dry. Memory cue: fog is water in the air, while rain is water large and heavy enough to fall.

Related tags

FogVisibilityPrecipitationWater-DropletsForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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